diff options
Diffstat (limited to 'ffmpeg1/libavutil/channel_layout.c')
| -rw-r--r-- | ffmpeg1/libavutil/channel_layout.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/ffmpeg1/libavutil/channel_layout.c b/ffmpeg1/libavutil/channel_layout.c deleted file mode 100644 index e582760..0000000 --- a/ffmpeg1/libavutil/channel_layout.c +++ /dev/null @@ -1,258 +0,0 @@ -/* - * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * audio channel layout utility functions - */ - -#include "avstring.h" -#include "avutil.h" -#include "channel_layout.h" -#include "bprint.h" -#include "common.h" - -struct channel_name { - const char *name; - const char *description; -}; - -static const struct channel_name channel_names[] = { - [0] = { "FL", "front left" }, - [1] = { "FR", "front right" }, - [2] = { "FC", "front center" }, - [3] = { "LFE", "low frequency" }, - [4] = { "BL", "back left" }, - [5] = { "BR", "back right" }, - [6] = { "FLC", "front left-of-center" }, - [7] = { "FRC", "front right-of-center" }, - [8] = { "BC", "back center" }, - [9] = { "SL", "side left" }, - [10] = { "SR", "side right" }, - [11] = { "TC", "top center" }, - [12] = { "TFL", "top front left" }, - [13] = { "TFC", "top front center" }, - [14] = { "TFR", "top front right" }, - [15] = { "TBL", "top back left" }, - [16] = { "TBC", "top back center" }, - [17] = { "TBR", "top back right" }, - [29] = { "DL", "downmix left" }, - [30] = { "DR", "downmix right" }, - [31] = { "WL", "wide left" }, - [32] = { "WR", "wide right" }, - [33] = { "SDL", "surround direct left" }, - [34] = { "SDR", "surround direct right" }, - [35] = { "LFE2", "low frequency 2" }, -}; - -static const char *get_channel_name(int channel_id) -{ - if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names)) - return NULL; - return channel_names[channel_id].name; -} - -static const struct { - const char *name; - int nb_channels; - uint64_t layout; -} channel_layout_map[] = { - { "mono", 1, AV_CH_LAYOUT_MONO }, - { "stereo", 2, AV_CH_LAYOUT_STEREO }, - { "2.1", 3, AV_CH_LAYOUT_2POINT1 }, - { "3.0", 3, AV_CH_LAYOUT_SURROUND }, - { "3.0(back)", 3, AV_CH_LAYOUT_2_1 }, - { "4.0", 4, AV_CH_LAYOUT_4POINT0 }, - { "quad", 4, AV_CH_LAYOUT_QUAD }, - { "quad(side)", 4, AV_CH_LAYOUT_2_2 }, - { "3.1", 4, AV_CH_LAYOUT_3POINT1 }, - { "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK }, - { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 }, - { "4.1", 5, AV_CH_LAYOUT_4POINT1 }, - { "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK }, - { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 }, - { "6.0", 6, AV_CH_LAYOUT_6POINT0 }, - { "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT }, - { "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL }, - { "6.1", 7, AV_CH_LAYOUT_6POINT1 }, - { "6.1", 7, AV_CH_LAYOUT_6POINT1_BACK }, - { "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT }, - { "7.0", 7, AV_CH_LAYOUT_7POINT0 }, - { "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT }, - { "7.1", 8, AV_CH_LAYOUT_7POINT1 }, - { "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK }, - { "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE }, - { "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL }, - { "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, }, -}; - -static uint64_t get_channel_layout_single(const char *name, int name_len) -{ - int i; - char *end; - int64_t layout; - - for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) { - if (strlen(channel_layout_map[i].name) == name_len && - !memcmp(channel_layout_map[i].name, name, name_len)) - return channel_layout_map[i].layout; - } - for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) - if (channel_names[i].name && - strlen(channel_names[i].name) == name_len && - !memcmp(channel_names[i].name, name, name_len)) - return (int64_t)1 << i; - i = strtol(name, &end, 10); - if (end - name == name_len || - (end + 1 - name == name_len && *end == 'c')) - return av_get_default_channel_layout(i); - layout = strtoll(name, &end, 0); - if (end - name == name_len) - return FFMAX(layout, 0); - return 0; -} - -uint64_t av_get_channel_layout(const char *name) -{ - const char *n, *e; - const char *name_end = name + strlen(name); - int64_t layout = 0, layout_single; - - for (n = name; n < name_end; n = e + 1) { - for (e = n; e < name_end && *e != '+' && *e != '|'; e++); - layout_single = get_channel_layout_single(n, e - n); - if (!layout_single) - return 0; - layout |= layout_single; - } - return layout; -} - -void av_bprint_channel_layout(struct AVBPrint *bp, - int nb_channels, uint64_t channel_layout) -{ - int i; - - if (nb_channels <= 0) - nb_channels = av_get_channel_layout_nb_channels(channel_layout); - - for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) - if (nb_channels == channel_layout_map[i].nb_channels && - channel_layout == channel_layout_map[i].layout) { - av_bprintf(bp, "%s", channel_layout_map[i].name); - return; - } - - av_bprintf(bp, "%d channels", nb_channels); - if (channel_layout) { - int i, ch; - av_bprintf(bp, " ("); - for (i = 0, ch = 0; i < 64; i++) { - if ((channel_layout & (UINT64_C(1) << i))) { - const char *name = get_channel_name(i); - if (name) { - if (ch > 0) - av_bprintf(bp, "+"); - av_bprintf(bp, "%s", name); - } - ch++; - } - } - av_bprintf(bp, ")"); - } -} - -void av_get_channel_layout_string(char *buf, int buf_size, - int nb_channels, uint64_t channel_layout) -{ - AVBPrint bp; - - av_bprint_init_for_buffer(&bp, buf, buf_size); - av_bprint_channel_layout(&bp, nb_channels, channel_layout); -} - -int av_get_channel_layout_nb_channels(uint64_t channel_layout) -{ - return av_popcount64(channel_layout); -} - -int64_t av_get_default_channel_layout(int nb_channels) { - int i; - for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++) - if (nb_channels == channel_layout_map[i].nb_channels) - return channel_layout_map[i].layout; - return 0; -} - -int av_get_channel_layout_channel_index(uint64_t channel_layout, - uint64_t channel) -{ - if (!(channel_layout & channel) || - av_get_channel_layout_nb_channels(channel) != 1) - return AVERROR(EINVAL); - channel_layout &= channel - 1; - return av_get_channel_layout_nb_channels(channel_layout); -} - -const char *av_get_channel_name(uint64_t channel) -{ - int i; - if (av_get_channel_layout_nb_channels(channel) != 1) - return NULL; - for (i = 0; i < 64; i++) - if ((1ULL<<i) & channel) - return get_channel_name(i); - return NULL; -} - -const char *av_get_channel_description(uint64_t channel) -{ - int i; - if (av_get_channel_layout_nb_channels(channel) != 1) - return NULL; - for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++) - if ((1ULL<<i) & channel) - return channel_names[i].description; - return NULL; -} - -uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index) -{ - int i; - - if (av_get_channel_layout_nb_channels(channel_layout) <= index) - return 0; - - for (i = 0; i < 64; i++) { - if ((1ULL << i) & channel_layout && !index--) - return 1ULL << i; - } - return 0; -} - -int av_get_standard_channel_layout(unsigned index, uint64_t *layout, - const char **name) -{ - if (index >= FF_ARRAY_ELEMS(channel_layout_map)) - return AVERROR_EOF; - if (layout) *layout = channel_layout_map[index].layout; - if (name) *name = channel_layout_map[index].name; - return 0; -} |